we are not kidding. in 2001, he became the first space tourist, paying $20 million to hitch a ride aboard a russian flight to the international space station. today, he announced plans to announce a manned journey to the red planet in 2018. this historic trip would be piloted by two private citizens. for more on his extraordinarily ambitious project and i spoke to him just a short time ago. value ofhe scientific this project? >> the scientific value is not the major objective of this mission. in fact, when i first started talking about the idea, i said it had in zero scientific value. and people i talked to said, no, dennis, you are wrong. there is tremendous scientific value as far as human behavior, life sciences.